Volcanic activity signals in tree-rings at the treeline of the Popocatépetl, Mexico
Alfaro Sánchez, Raquel (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Camarero, J. Julio (Instituto Pirenaico de Ecología)
Querejeta, José I. (Centro de Edafología y Biología Aplicada del Segura - CSIC)
Sagra, Javier (Universidad de Castilla-La Mancha)
Moya, Daniel (Universidad de Castilla-La Mancha)
Rodríguez-Trejo, Dante Arturo (Universidad Autónoma Chapingo (Mèxic))

Data:	2020
Resum:	The Popocatépetl volcano resumed its eruptive activity in 1994 and is still active. The largest eruption recorded during this new stage of activity occurred in December 2000. We traced the volcanic activity signal in tree-rings from Pinus hartwegii trees located in the north slope of the volcano, located at ∼3 km from the volcanic cone. Annually resolved tree-ring widths, elemental and stable δ13C and δ18O isotope composition were measured during the period 1989-2014 to study the effects of the volcanic activity on trees. Our results indicate a high increase in the concentration of metal elements (Co, Cr, Cu, Fe, Li, Mo, Ni, Pb, Rb, Sr, Ti, Zn) in tree rings following the major 2000 volcanic eruption, compared to the pre-eruption period from 1989 to 1993. Other chemical elements such as Al, K and S peaked 2 years later, in the 2003 tree ring, that matched with the formation of a very narrow ring that year. This sharp reduction of growth was probably driven by a combination of harsh climatic conditions (drought) with the lagged negative effects of the 2000 eruption. Carbon isotope discrimination (Δ13C) and δ18O increased from 1995 to 2006, suggesting reduced stomatal conductance, photosynthetic activity and water use efficiency due to the large dust veil covering the study zone. The variation of relevant elements (Ca, Mn) showing significant correlations with tree growth, Δ13C and δ18O can be attributed to the selective availability of elements following the soil acidification caused by the volcanic activity. Our findings suggest that the recent activity of the Popocatépetl might have increased tree vulnerability, as reflected in the sharp reduction of growth following the drought recorded 2 years after the large eruption of December 2000. Our results warn about the cumulative negative effects of volcanic activity and harsh climatic conditions on tree growth and functioning.
Ajuts:	Ministerio de Economía y Competitividad FJCI-2015-26848 Ministerio de Economía y Competitividad CGL2015-69186-C2-1-R
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Tree-rings ; Pinus hartwegii ; Dendrochemistry ; Carbon isotope discrimination ; Oxygen isotopes
Publicat a:	Dendrochronologia, Vol. 59 (February 2020) , art. 125663, ISSN 1612-0051

DOI: 10.1016/j.dendro.2020.125663

Postprint 33 p, 631.6 KB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
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